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method of complements

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  1. In mathematics and computing, the method of complements is a technique used to subtract one number from another using only addition of positive numbers

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on November 21, 2008
  2. This method was commonly used in mechanical calculators and is still used in modern computers

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on November 21, 2008
  3. To subtract a number y (the subtrahend) from another number x (the minuend), the radix complement of y is added to x and the initial '1' of the result is discarded

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on November 21, 2008
  4. Discarding the initial '1' is especially convenient on calculators or computers that use a fixed number of digits: there is nowhere for it to go so it is simply lost during the calculation

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on November 21, 2008
  5. While the complements method involves one more step than borrowing, it reuses rote knowledge already learnt for addition whereas to do borrowing efficiently requires learning another set of number pairings

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on November 21, 2008
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